Connelly, James Norman6; Bizzarro, Martin6; Krot, Alexander N.4; Nordlund, Åke7; Wielandt, Daniel Kim Peel6; Ivanova, Marina A.5
1 Natural History Museum of Denmark, Faculty of Science, Københavns Universitet2 Astrophysics and Planetary Science, The Niels Bohr Institute, Faculty of Science, Københavns Universitet3 Natural History Museum of Denmark, Natural History Museum of Denmark, Faculty of Science, Københavns Universitet4 University of Hawai‘i at Manoa5 Vernadsky Institute of Geochemistry and Analytical Chemistry6 Natural History Museum of Denmark, Natural History Museum of Denmark, Faculty of Science, Københavns Universitet7 Astrophysics and Planetary Science, The Niels Bohr Institute, Faculty of Science, Københavns Universitet
Transient heating events that formed calcium-aluminum - rich inclusions (CAIs) and chondrules are fundamental processes in the evolution of the solar protoplanetary disk, but their chronology is not understood. Using U-corrected Pb-Pb dating, we determined absolute ages of individual CAIs and chondrules from primitive meteorites. CAIs define a brief formation interval corresponding to an age of 4567.30 ± 0.16 million years (My), whereas chondrule ages range from 4567.32 ± 0.42 to 4564.71 ± 0.30 My. These data refute the long-held view of an age gap between CAIs and chondrules and, instead, indicate that chondrule formation started contemporaneously with CAIs and lasted ~3 My. This time scale is similar to disk lifetimes inferred from astronomical observations, suggesting that the formation of CAIs and chondrules reflects a process intrinsically linked to the secular evolution of accretionary disks.